Intelligence Community Standard Number 705-2: Standards for the Accreditation and Reciprocal Use of Sensitive Compartmented Information (Effective 17 September 2010) [open pdf - 857KB]
The purpose and applicability of this standard is as follows: "This Intelligence Community Standard sets forth the criteria that apply to the accreditation of sensitive compartmented information facilities (SCIF) to enable reciprocal use by all Intelligence Community (IC) elements and to facilitate information sharing to the greatest extent possible. This Standard applies to the IC, as defined by the National Security Act of 1947, as amended; and such other elements of any other department or agency as may be designated by the President, or designated jointly by the Director of National Intelligence (DNI) and the head of the department or agency concerned, as an element of the IC."
ICS 705-2; Intelligence Community Standard 705-2
Federation of American Scientists: http://www.fas.org